Vegetable Seeds are used in the production of vegetable seeds, divided into conventional and hybrid seeds.Vegetables that conventional types of vegetables to grow itself through natural laws of seeds, vegetables hybrid seeds (general hybrid F1 generation of hybrid) is by using different features of plants (male and female parent) for their pollination, change its characteristics.
First, many varieties and complex.In science and technology is the first productive force and science and technology oriented market sense, such as policy, scientific research institutions, experts and scholars engaged in the work of agricultural breeding have mushroomed, new achievements and new varieties are created.The resulting problems, a species and strains are many, character difference is small, removing impurity harder when breeding, varieties of authenticity and purity is difficult to guarantee;Second, in many scientific research units and experts and scholars of breeding race, south guo is inevitable the sham as the genuine, some traits instability, poor adaptability, or no market with a production value of species, strain, misleading, interfere with the normal order of seed production and operation.So for buying vegetable seeds, should be on the basis of reputation good place.Buy formal cultivated seeds.
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Symptoms: Infested plants do not show obvious symptoms at the seedling stage and only show typical lesions at the flowering stage. Symptoms are mainly manifested by the significant growth of glumes, lemmas, and medial cysts of parasitized florets, reaching 2-3, 5-8, and 4 times the normal length, respectively, and the ovary within it transforms into a cigar-like worm. . Insects began to form green, purple brown later, 4-5mm long, and the length of normal caryopsis is only about 1 mm.
Pathogen: The pathogen is Anguina agrostis (Steinbuch) Filip-jev.
Incidence of the disease: The pathogenic nematodes spend their summer drought in the second instar larvae. Insects break down in the field in the event of autumn rain, and the larvae escape and infect the seedlings of the host plant. When the host enters the reproductive period in the spring of the following year, the 2nd instar larvae invade the flower buds of the developing inflorescence and quickly develop into adults. At this time, the infected ovary has been transformed into insects. Insects females lay eggs after fertilization, and eggs hatch out 2nd instar larvae. The peak period of nematode spawning and egg hatching occurred in late spring and early summer. The 2nd instar larvae that hatched after the eggs enter dormancy within the galls, and thus begin a new round of disease cycles. Diseased seeds and plant tissue are the source of transmission of nematodes. The long-distance transmission of diseases mainly depends on the transport of diseased seeds, while the spread of medium and short-distance wins is due to the operation of farm machinery, clothes, boots, etc., contaminated with existing insects, and the transportation of wind and water in the wards.
Prevention: 1 strengthen quarantine. (2) To strengthen field sanitation by removing the attached insects such as agricultural implements to prevent the spread of diseases. 3 Implement rotation or recreation (more than one year) so that the nematode cannot infect the appropriate host and reduce the re-infection source. 4 Fields use specific herbicides such as dalapon or maleic hydrazide, or regularly turf grasses to suppress the flowering of host plants so that nematodes cannot complete their life history.
The prevention and treatment of nymphal nematode disease
The disease is a quarantine disease. China has a distribution in Inner Mongolia. It mainly harms the inflorescence of the host plant, resulting in a decline in the yield of seeds and aboveground parts of the diseased plant, and it may pose a serious threat to production in the area where the forage bentgrass is widely planted.
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